Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin. Free temperature converter with the exact mathematical relationships for all six conversions.

A temperature converter handles Celsius, Fahrenheit, and Kelvin — the three major temperature scales — using their exact mathematical relationships. Unlike length or weight conversions (which are simple multiplication), temperature conversion requires both scaling and offset: Celsius to Fahrenheit multiplies by 9/5 and adds 32, and Kelvin to Celsius adds 273.15. This converter handles all six directional pairings automatically so you never need to memorize the formulas.

input

Result

77.0000

Breakdown

Value In Celsius
25.000000

About Temperature Converter

What is temperature converter?

A temperature converter handles Celsius, Fahrenheit, and Kelvin — the three major temperature scales — using their exact mathematical relationships. Unlike length or weight conversions (which are simple multiplication), temperature conversion requires both scaling and offset: Celsius to Fahrenheit multiplies by 9/5 and adds 32, and Kelvin to Celsius adds 273.15. This converter handles all six directional pairings automatically so you never need to memorize the formulas.

How to use this calculator

  1. Enter your value.
  2. Enter your from unit.
  3. Enter your to unit.
  4. Click the "Calculate" button.
  5. View your result instantly — the main result is displayed prominently at the top with a detailed breakdown below it.

When to use this calculator

  • Converting cooking temperatures between Celsius and Fahrenheit
  • Interpreting international weather forecasts in your familiar scale
  • Converting scientific data between Kelvin and Celsius for lab work
  • Checking body temperature readings across different thermometer settings
  • Helping students understand the three major temperature systems

How the calculation works

Temperature uses formula-based conversion, not simple multiplication. Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Celsius to Kelvin: K = °C + 273.15. Kelvin to Celsius: °C = K − 273.15. This converter first converts the input to Celsius, then converts Celsius to the target unit. For example, 25°C to Fahrenheit: 25 × 9/5 + 32 = 45 + 32 = 77°F — a warm day. Body temperature 98.6°F to Celsius: (98.6 − 32) × 5/9 = 66.6 × 5/9 = 37°C.

Frequently Asked Questions

How does the temperature converter work?▼
Unlike length or weight conversions, temperature requires both scaling and an offset. Celsius to Fahrenheit multiplies by 9/5 and adds 32. This converter handles all six directional pairings (C-F, C-K, F-C, F-K, K-C, K-F) automatically.
What is absolute zero in each scale?▼
Absolute zero is 0 Kelvin = -273.15 Celsius = -459.67 Fahrenheit. It is the lowest possible temperature where all thermal motion stops. Kelvin has no degree symbol and is never negative.

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